Printed on matte, highly water resistant sticker paper.
I personally use this on my thermos, and though it doesn't disintegrate into tiny clumps when washed, there is an ink blot smudge that is hardly noticeable. It is up to you if you would like to use it on hydroflasks. This is not weatherproof.
Sad Tulip Sticker
No return or refunds on any merchandise.